[Info-vax] OT: the Daily WTF for today is a VAX/VMS story

[Johnny Billquist]

On 2016-02-15 12:18, terry-groups at glaver.org wrote:
> On Sunday, February 14, 2016 at 8:31:49 AM UTC-5, Scott Dorsey wrote:
>> I don't know of any DEC drives that use a motor attached directly to the
>> AC line.  That's not to say that they don't exist, but I have never used
>> one.  IBM had some.
>
> The DEC RP07 (which I believe was a re-badged Memorex something-or-other IBM 338x clone) did. From ER-ORP07-SV: "The disk stack rotation system of the RP07 drive, consists of the following: 1. A double-ended three phase drive motor with an attached electromagnetic brake on the bottom end and a pulley on the top. ..." It also used 3 phase power for the blower motor. However, it had a phase sequence detector board which would light an "Unsafe" lamp on the front panel if the phases were out of sequence.

The RP05 and RP06 was Memorex. The RP07 was Sperry I think.
But it was not a synchronous motor, which is what I meant above.

	Johnny

-- 
Johnny Billquist                  || "I'm on a bus
                                   ||  on a psychedelic trip
email: bqt at softjar.se             ||  Reading murder books
pdp is alive!                     ||  tryin' to stay hip" - B. Idol